and is slowly improving. >> i'm skittish now about going back to buying foods. i don't know what to buy. i don't where to go eat. and, you know, actually, i mean, i'm still not out of the woods here. i'm still feeling poorly. >> schieffer: so, jon, here is my question-- if they know where this contaminated salad mix in iowa and nebraska is probably coming from, why aren't they saying that? are they putting business interests ahead of public health? >> reporter: bob, we've been pushing the f.d.a. and c.d.c. for this on days. i spoke to the c.d.c. about an hour ago and was told just because a certain brand of salad is infected it doesn't mean that brand is the ultimate source of the infection. for example, it could be coming from a common distributor, a common processing plant, which involves a lot of other brands. so for now, they're saying, look, we're getting closer. we're eliminating certain things, and we're going to probably be giving you some more information soon but right now we're not ready to say anything more.